Here we report on measurements of the spin-Seebeck effect of GaMnAs over an extended temperature range alongside the thermal conductivity, specific heat, magnetization, and thermoelectric power. The amplitude of the spin-Seebeck effect in GaMnAs scales with the thermal conductivity of the GaAs substrate and the phonon-drag contribution to the thermoelectric power of the GaMnAs, demonstrating that phonons drive the spin redistribution. A phenomenological model involving phonon-magnon drag explains the spatial and temperature dependence of the measured spin distribution.
@article{arxiv.1102.1024,
title = {Phonon driven spin distribution due to the spin-Seebeck effect},
author = {C. M. Jaworski and J. Yang and S. Mack and D. D. Awschalom and R. C. Myers and J. P. Heremans},
journal= {arXiv preprint arXiv:1102.1024},
year = {2011}
}